Display screen or portion thereof with transitional icon



FIG. 1 is the first image in a sequence for a display screen or portion thereof with transitional icon showing our new design;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof;

FIG. 5 is the fifth image thereof;

FIG. 6 is the sixth image thereof; and,

FIG. 7 is the seventh image thereof.

The outermost broken lines in the drawings illustrate the display screen or portion thereof and form no part of the claimed design. The remainder of the broken lines in the drawings illustrate portions of the transitional icon that form no part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-7. The process or period in which one image transitions to another image forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with transitional icon, as shown and described. 